Quark Matter 2018

Session

Phase diagram and search for the critical point

16 May 2018, 09:00

Sala Volpi, 1st Floor (Palazzo del Casinò)

Conveners

Phase diagram and search for the critical point: I

• Krishna Rajagopal (Massachusetts Inst. of Technology (US))

Phase diagram and search for the critical point: II

• Claudia Ratti (University of Houston)

Phase diagram and search for the critical point: III

• Helen Caines (Yale University (US))

727. The QCD Phase Diagram from Statistical Model Analysis

Reinhard Stock

16/05/2018, 09:00

Phase diagram and search for the critical point

Parallel Talk

Ideally, the Statistical Hadronization Model (SHM) freeze-out curve should reveal the QCD parton-hadron phase transformation line in the ($T$,$μ_B$) plane. We discuss the effects of various final state interaction phenomena, like baryon-antibaryon annihilation, core-corona effects or QCD critical point formation, which shift or deform the SHM freezeout curve. In particular, we present a method...

176. Baryon clustering near a (hypothetical) QCD critical point I

Edward Shuryak (stony brook university)

16/05/2018, 09:20

Phase diagram and search for the critical point

Parallel Talk

Clustering in systems with attractive forces are known in many physical settings:
for example in formation of globular clusters in Galaxies.
Formation of nuclear fragments is a well known phenomenon in low energy nuclear collisions,
especially at temperatures $T\sim 10\, MeV$ near the gas-liquid critical point.
At a freezeout stage of high energy collisions, with $T=100-150\, MeV$,
no...

845. Search for the QCD critical point through the rapidity dependence of cumulants

Jasmine Brewer (Massachusetts Institute of Technology)

16/05/2018, 09:40

Phase diagram and search for the critical point

Parallel Talk

In the coming Beam Energy Scan, RHIC will have much higher luminosity at $\sqrt{s}=20$ GeV than it will at $\sqrt{s}=10$ GeV and below. With the STAR iTPC upgrade in place they will be able to reach proton rapidities up to $|y|\sim 0.8$ where the baryon chemical potential $\mu_B$ in $\sqrt{s}=20$ GeV collisions is somewhat higher than at mid-rapidity. They may therefore be able to use the...

365. Search for the critical point by the NA61/SHINE experiment

Evgeny Andronov (St Petersburg State University (RU))

16/05/2018, 10:00

Phase diagram and search for the critical point

Parallel Talk

NA61/SHINE is a fixed target experiment operating at CERN SPS. Its main goals are to search for the critical point of the strongly interacting matter and to study the onset of deconfinement. For these goals a scan of the two dimensional phase diagram (T-$\mu_B$) is being performed at the SPS by measurements of hadron production in proton-proton, proton-nucleus and nucleus-nucleus interactions...

563. PHENIX Measurements of $dN_{ch}/d\eta$ in small systems (p$+$A, d$+$Au, and $^{3}$He$+$Au)

Darren McGlinchey (Los Alamos National Laboratory)

16/05/2018, 10:20

Phase diagram and search for the critical point

Parallel Talk

The PHENIX experiment has an excellent data set for small systems including p+Au, d+Au, 3He+Au at 200 GeV as well as the d+Au beam energy scan down to 19.6 GeV. We present new measurements of $dN_{ch}/d\eta$ for all of these systems over a broad range in pseudorapidity $-3 < \eta < +3$ and event multiplicity. These measurements provide key constraints of baryon stopping models and are compared...

729. Constraining the QCD critical point from lattice simulations

Attila Pasztor (University of Wuppertal)

16/05/2018, 11:10

Phase diagram and search for the critical point

Parallel Talk

We examine the reliability of available methods to constrain the location
of the critical endpoint from lattice simulations. For this, we use
several lattice simulations. First, we reexamine the Fodor-Katz
critical endpoint estimate using the same staggered lattice with
modern methods. Second, we look at the compatibility of the
reweighting result with estimates of the convergence radius of...

763. QCD transition at zero and non-zero baryon densities

Patrick Steinbrecher (Brookhaven National Laboratory and University of Bielefeld)

16/05/2018, 11:30

Phase diagram and search for the critical point

Parallel Talk

We will present new state-of-the-art lattice QCD results on the chiral crossover temperature of QCD for moderately large baryon chemical potential. Firstly, we will present a more precise updated result for the QCD pseudo-critical temperature at zero baryon chemical potential, obtained from all possible second-order chiral susceptibilities that diverge in the chiral limit. Then we will present...

405. Higher moment fluctuations of identified particle distributions from ALICE

Nirbhay Kumar Behera (Inha University (KR))

16/05/2018, 11:50

Phase diagram and search for the critical point

Parallel Talk

We present the first measurements of skewness and kurtosis of fluctuations of identified particle distributions measured with ALICE in Pb-Pb collisions. These distributions can be related to conserved quantum number fluctuations. The measurements can also be compared to RHIC measurements at lower energies and lattice QCD and hadronic resonance gas model calculations to obtain quantum number...

313. Hidden strangeness shines in NA61/SHINE

Antoni Marcinek (Polish Academy of Sciences (PL))

16/05/2018, 12:10

Phase diagram and search for the critical point

Parallel Talk

One of the main objectives of the NA61/SHINE experiment at the CERN SPS is to
study properties of strongly interacting matter (SIM). This includes a
two-dimensional scan in the beam momentum and size of the colliding system, to
investigate the onset of deconfinement discovered by NA49, and to search for
the critical point of SIM. This contribution presents first ever results on
$\phi$ meson...

665. Lattice-based QCD equation of state at finite baryon density

Volodymyr Vovchenko (Frankfurt Institute for Advanced Studies)

16/05/2018, 12:30

Phase diagram and search for the critical point

Parallel Talk

Lattice QCD methods allow to calculate the thermodynamic observables at finite temperature and imaginary chemical potential. The Wuppertal-Budapest collaboration data [1,2] for the temperature dependence of the leading four Fourier coefficients of the imaginary part of the net-baryon density at imaginary baryochemical potential is analyzed. We demonstrate how the lattice behavior of these...

585. Recent Results and Methods on Higher Order and Off-diagonal Cumulants of Identified Net-particle Multiplicity Distributions in Au+Au Collisions at STAR

Toshihiro Nonaka (Univ. Tsukuba)

16/05/2018, 12:50

Phase diagram and search for the critical point

Parallel Talk

The ratios of the cumulants of identified net-partile multiplicity distributions have been suggested to be sensitive to the onset of QCD phase transition and to the additional fluctuations expected from the close proximity to the critical point [1,2,3].
We report the first measurements of $6^{th}$ order cumulants of net-charge distributions, up to $3^{rd}$ order cumulants of net-$\Lambda$...

545. Hydro+ : Hydrodynamics for the QCD critical point

Misha Stephanov (UIC)

16/05/2018, 14:40

Phase diagram and search for the critical point

Parallel Talk

The search for the QCD critical point in heavy-ion collision
experiments requires dynamical modeling of the bulk evolution of the
QCD matter as well as of the fluctuations near the critical
point. Critical slowing down means that fluctuations are significantly
deviating from equilibrium near the critical point. We generalize
hydrodynamics to quasi-equilibrium conditions where the state of...

308. Identifying the QCD transition with deep learning

Dr Long-Gang Pang (Physics department of UC Berkeley)

16/05/2018, 15:00

Phase diagram and search for the critical point

Parallel Talk

The state-of-the-art pattern recognition method in machine learning (deep convolution neural network) is used to identify the equation of state (EoS) employed in the relativistic hydrodynamic simulations of heavy ion collisions. High-level correlations of particle spectra in transverse momentum and azimuthal angle learned by the network act as an effective EoS-meter in deciphering the nature...

778. Time-evolution of fluctuations as signal of the phase transition dynamics in a QCD-assisted transport approach

Nicolas Wink (University of Heidelberg)

16/05/2018, 15:20

Phase diagram and search for the critical point

Parallel Talk

For the understanding of the fluctuation measurements in heavy-ion collisions
it is crucial to develop quantitatively reliable dynamical descriptions. In order
to study the phase transition, both in crossover regime as well as near the
conjectured QCD critical point, the non-perturbative nature needs to be fully
included. In this talk, we outline a novel QCD-assisted transport approach based...

799. Transits of the QCD Critical Point

Mr Fanglida Yan (Stony Brook University)

16/05/2018, 15:40

Phase diagram and search for the critical point

Parallel Talk

Building on an analysis of hydrodynamic long time tails for a Bjorken expansion (Akamatsu 2017, Akamatsu 2017), we discuss the hydrodynamic scales associated with transiting the critical point. First, we consider the case where the nuclear medium passes directly through the critical point. In this case, the modes with wave-number of order the inverse Kibble-Zurek length and smaller fall out of...

346. Open charm measurements in the NA61/SHINE experiment - status and plans

Pawel Piotr Staszel (Jagiellonian University (PL))

16/05/2018, 16:00

Phase diagram and search for the critical point

Parallel Talk

The measurement of open charm production was proposed as an important tool to
investigate the properties of hot and dense matter formed in nucleus-nucleus collisions as well as to provide the means for model independent interpretation of the existing data [1]. Recently, the experimental setup of the NA61/SHINE experiment was supplemented with a Vertex Detector (VD) which was motivated by the...